Ten-key adding machine



March 16, 1937. F. L. FULLER Ef AL TEN-KEY ADDING MACHINE 5 Sheets-Sheet I Original Filed Sept. '7, 1934 Of. Y

1N E N O 5 I ATTORNEY March 16 1937. F. 1 FULLER AL 29974,@37

TEN-KEY ADDING MACHINE Original Filed Sept. 7, 1934 5 Sheets-Sheet 2 ATTORNEY March 15, 1937. F FULLER Er AL 2,974,037

TEN-KEY ADDING MACHINE Original Filed Sept. 7, 1934 5 Sheets-Sheet 3 ATTORNEY 5' Sheets-Sheet 4 .maui

INVENTORS ATTORNEY 1%. ..55 ...1, .K t @s w NG F. L. FULLER ET AL TEN March 16, 1937.

-KEY ADDING MACHINE Orlginal Filed Sept. 7, 1934 Patented diddl? erica TEN-KEY ldDlDllNG MACHINE @riginal application September ri, i934, Seriali No. 743,044. Divided and this application July 3l, i935, Serial No. 34,@2@

ll'i' Claims.

This invention relates to adding machines and more specifically to the type controlled by ten digit keys.

This application is a division of the applica- 5 tion oi F'. L. Fuller and S. Brand, Serial No. 743,044, filed September 7, 193i for Combined record sorting and accounting machines.

The main object of the present invention is to devise a ten-key adding machine which is siml ple in construction, reliable in operation and which requires a minimum of expenditure of manual power.

The present machine is provided with a series of item set-up wheels which are successively l set up as the keys are operated. By means oi* a power-operated mechanism the differential setup oi these wheels is conveyed to a set of printing elements or to totalizer elements. With the exception of the specific form of mechanism herein employed this form of mechanism is old and well known in the art. The present machine includes particularly improved constructions whereby the set-up wheels are successively set up as the keys are operated in a manner that requires a minimum expenditure of manual power.

The item wheels are successively set up by means of a master Wheel which is operated by' a power drive through a friction drive, the source of power being preferably the same power drive that causes the dierential setting of the totalizer or printing elements.

The differential position of the master wheel is controlled by a digit set-up mechanism which consists of a rotary drum provided with a series of longitudinally shiftable pins or digit stops. one of which is in shifted position to normally prevent rotation ci the master wheel by the friction drive.

The selection of and the positive shitting oi these digit stops are eiected by electrical means under control of the keys, the depression of a key causing the energization of a related magnet which shifts the associated digit stop.

The keys are adapted to be successively depressed to set up the item wheels. To eliminate manual power in operating controlling devices usually operated by these keys electrical-poweroperated devices are provided in the present machine. Such an arrangement insures that incidental operations, such as, the release oi the master wheel for rotation, the escapement of the item wheels, the energization and deenergization of controlling magnets, etc., will always take placeindependent of manual power and 55 which in. prior constructions was a decided objection since a key was depressed with diculty and it could be returned before its stroke was completed to effect the incidental operations.

Each key when manually depressed a slight extent operates a member which closes associated contacts of the circuit of the magnet that shifts a digit stop. By common control means each key closes a set of main control contacts which causes the energization of the digit stop shifting magnet and a supplemental electro-magnet. The latter causes a coupling device to complete the operation of the member and also releases the digit stop carrying drum for rotation. The master wheel rotates with the drum until the shifted digit stop stops its rotation. Subsequently, when the rst item wheel is set up an escapement mechanism operated by the supplemental electro-magnet causes the master wheel to engage the next item wheel, and thereafter all electrical circuits are opened for their normal condition.

By the construction just described a very slight and light key touch is provided and the item may be set up on the wheels by a rapid and light depression of the keys. The correctness of the set-up operation may be veriiied by a visual reading of numerals on the item wheels.

A still further object of the present invention is to provide an error key with improved controlling mechanism whereby an incorrect item set-up on the item wheels may be erased without transmittal of the amount to the totalizer or printing elements.

A further object of the present invention is the provision of a key-release-key for manually releasing the locked down error key.

Other objects and advantages will appear from the following specification and drawings in which drawings:-

Fig. l is a sectional view of the ten-key mechanism and part of the electrical controlling mechanism.

Fig. 2 is another sectional view of the tenkey mechanism showing particularly the electrical coupling mechanism and electrical contact devices.

Fig. 3 is a plan View, greatly reduced, showing the keyboard arrangement.I

Fig. 4 is a top plan view of the item entering mechanism and the ten-key controlling mechanism. l

Fig. 5 is a detail View of the device for shifting the set-up wheels when amounts are successively set thereon.

Fig. 6 is a detail view in side elevation of the item set-up wheels, the rack engaging mechanism for the item wheels and the error key mechanism.

Fig. 7 is a view in front elevation showing a part of the ten-key set-up mechanism and the means for driving the master wheel for the set-up wheels.

Fig. 8 is a detail View of the set-up mechanism and the means for restoring the set-up wheels to home or normal positions.

Fig. 9 illustrates the preferred 'form o one revoluti clutch mechanism.

Fig. 10 is an electrical wiring diagram of the machine.

Fig. 11 is a view of part of the printing mechanism and totalizing mechanism Fig. 12 is a detail View oi the key-release mechanism.

Framework The various mechanisms are carried by a suitable base (not shown) and parallel side frames lll and liti (Fig. 4f) which primarily carry the ten-key controlling mechanism. IThe item set-up mechanism and 'item entering mechanism are carried by the frame plates 3l and 32.

Amount set-up mechanism To enter an item the operator sets up the amount to be entered on the ten-key amount set-up mechanism which includes the keys il@ (Figs. 1, 2, and 3). Bepression of any of these keys operates mechanism now to be described in identically the same manner and effects a dinerential rotation of a master wheelto set amounts corresponding in digital value to the particular keys depressed on corresponding set-up wheels, which amounts are later transferred to a rack system to operate the totalizers or to set up printing elements.

Since the operation of each of the keys is exactly the same, a description will be given of the operation of the set-up mechanism upon depression of only one of the said keys, for example, the 6" key.

As is shown in Figs. l and 2, the bifurcated lower ends of the key stems lll of the keys il@ each embrace a stud l2@ on a pivoted arm 12H, there being an arm l2i associated with each' key il. The arms l2l are urged upwardly against a stop rod Q55 by individual springs it set in a cross bar El which bar is also slotted to guide the arms l2l. Pivoted on the stud l2@ is a latch it having a cam slot Lit@ therein embracing a rod li'ltl supported on projections of the cross bar 136i.

The first downward movement of the depressed key cams the latch M38 counterclockwise to engage the shoulder end thereonbeneath an angular bail lil@ underlying all the arms i2l and carried by arms All? and 518 (see also Fig. 4) pivoted on the shaft E22. The arm (WS (Fig. 2) extends upwardly and a spring M9 stretched between a stud i on said arm and an arm 28| pivoted on a shaft 822 normally holds a shoulder llla of the arm dBi against the stud i580. When the arm 12H moves downwardly under the inuence of the depressed key it rocks the bail 176 and arms fill and Q18 counterclockwise, and, through the spring M9, rocks the arm ll in the same direction, thrusting upwardly a link 682 held by a spring 583 against an arm 3813 secured to a shaft Q which arm ld is held against a stop stud G86 by a spring 381. The upper end of the link 682 abuts against an insulating block 688 atraer? supported on the lower one of a pair oi' switch blades carrying contacts G89 (see also Fig. i0A right side of the sheet near the center) closing said contacts.

Closing contacts 389 energizes a bail magnet i90 (Figs. 1, 2, and 10) which operates another bail including arms 119i and 692 (Fig. 4) pivoted on the shaft 22 and Connected at their left hand ends (Figs. 1 and 2) by a bail 593. Between them the arms i911 and Q92 also carry an armature 59d adapted to be operated by the magnets 596.

Examination of Figs. 1 and 2 discloses that the bail 593 rests just above and in contact with the angular or flanged part of the bail lit. When a key lill is depressed and arm l2! rocked, the bail G16 moves downwardly away from the bail 123, but energization of magnets ligt rocks the bail Q93 downwardly into contact with the now' lowered bail 316 to prevent restoration of the latter until magnets dell are deenergized. The bail lgis cut away beneath all of the arms i2i. Consequently, downward movement of these arms does not aiect the bail 393.

The arm $92 (Fig. 2) is integral with an upwardly extending arm 595 and a spring 39S holds this arm and the bail Q93 in retracted position until the magnets i90 are energized whereupon the bail 493 and the arm 495 are rocked counterclockwise. At this movement a link 459i pivotally connected to the free end of the arm '395 is drawn toward the left for the purpose o operating an escapement device which permits an amount corresponding in value to the particular key l l0 depressed to be set on one of a group of set-up wheels 398 (Figs. 4, 6, and 7).

These wheels are mounted on a shaft (las supported in the frame plate 32 and in a bracket 5B@ secured to the frame plate 3i (Fig. 4.), and are slidable as a group longitudinally on the shaft 399 toward the left from the position in which they appear in Fig. 4 by means to be described later. \In this position (Figs. l and 7) the wheel 198 on the extreme left is in mesh with a master set-up wheel 506 secured to a shaft 58T! mounted in the frames Si and 32. Hubbed to the gear 506 is a friction disk 528 which cooperates through the medium of a facing 509 of leather, or other suitable material, with a disc 5l@ fast to a constantly rotating gear 5l l. A spring FB2 compressed between a hub 513 of an arm 5M on the shaft Sill and a disc l provides a constant pressure between the discs 50B and 5l@ whereby the gear Ell drives the gear 506 when the latter is freed by the above mentioned es capement device.

The gear 5H meshes with a gear Slt secured to a shaft S3 which rotates constantly when the n machine is in operation.

Fast on the left hand end of the shaft titl] (Fig. 7) is a gear 5H meshing with a gear 5m on a shaft 5i@ (see also Fig. 4) on which is also mounted a pin drum 52. The drum 520 has slidably mounted therein a plurality of pins 52l (Figs. 1, 4, and 7) adapted, when thrust toward the right (Fig. 7.) to cooperate with an escapement pawl 522 fast lon a shaft 523. The upper end of an arm 526 also fast on the shaft 523 (Fig. 2) rests in the path of the lower end o a lever 525, the upper end of which lever 525 rests normally in the left hand end of a recess 526 in the lower side of the link i591.

Depression of a key H0, for instance the "6 key, rst closes the corresponding contacts and then, as the depressed key nears the limit of its downward travel, the link 552 clos-es the contacts 55@ completing a circuit from the line |152 (Fig. l), wire i455, contacts |25 now closed and corresponding to the particular key depressed, a pin control magnet 521, contacts 525 now closed, contacts 555 now closed, to line itt. A circuit is also completed from wire ISB through a relay magnet 525, contacts 523 normally closed, contacts 585 now closed to line 63. The relay magnet 525 closes its relay contacts 555 so that at substantially the same time contacts i159 are closed a circuit is established from line i532 to the bail magnets 490 and through both contacts @t and 555 to line 163.

Energization of the pin magnet 525 (Fig. 7) in this example the 6 magnet, attracted its armature 555 which acts to thrust the particular pin 529 then in line with said armature toward the right (Fig. 7) into the plane of a nose 557 on the escapement pawl 522. The pin drum 525 is normally prevented from rotating due to the pin .B2i previously set-up resting against the nose 5113i of the escapement pawl 522. As soon as the selected pin 52l is setup, the pin magnet 52'@ has accomplished its purpose for the instant operation and may be deenergized. This is eiected by the arm 555, which, as it nears the end of its counterclockwise movement, strikes the button or block 5152 and opens contacts 525. This also de-energizes magnet 529, opening contacts 535. The bail magnets 595, however, are held energized through the contacts 485, which do not open until the projected pin B2i nears the end of its movement, which movement is limited by the nose 53? of the escapement member 522.

When the bail magnet 555 is energized it rocks the balls @l5 and 493 counterclockwise as set forth above and near the end of this stroke the link 69T( (Fig. 2) rocks the lever 525 counterclockwise, said lever at the same time rocking the arm 525, shaft 525 and the escapement pawl 523 clockwise removing the nose 55H from the path of the pin 52E then pressing against said nose thus freeing the pin drum 52E) and the shaft 5i@ for rotation.

The armature 555 of the several digital pin magnets 52'i are spaced dierentially away from the nose 553i of the escapement pawl 522 in a counterclockwise direction so that when the pawl 522 is rocked to free the drum 52@ said drum and the shaft 5i@ will rotate a distance a number of steps proportional to the particular key liti depressed, which in this case is the 6 key when it is again arrested by the projected pin 526 striking the pawl 522. This pawl was returned to its former position (Fig. l) by one oi a series oi teeth 535 on the drum 525 wiping an ear 559 on the opposite end of the pawl 522 thus rocking said pawl counterclockwise.

As the projected pin 522i approaches the nose 555 of the escapement pawl 522 is strikes an arm 555 (Fig. l) fast on the previously described shaft 555 rocking this shaft and the arm (hifi (Fig. 2) ,counterclockwise It will be remembered that the spring 553 normally presses the link Q52 against the arm 5N. The counterclockwise movement of the arm 484 rocks the link (352 also counterclcckwise carrying the upper end of said link clear of the block 8 whereupon the contacts 455 immediately open, de-energizingmagnet 1355.

The pin titi last set up remains eective to hold the drum 525 against rotation until another key is depressed operating the pawl 525. The pin primarily set up is restored just after it passes the nase 551i by a cam face on the end oi a ,ori

bracket 535 (Fig. 7) projecting from a frame iii?.

As the bail 393 (Fig. 2) and the arm (355 near the end of their counterclockwise excursion the link 451i rides onto a stud 5M which rocks said link upwardly clear of the lever 525 which is then permitted to be restored to its normal position as the tooth 539 (Fig. 1) wipes the ear 555 rocking the pawl 522, shaft 523 and arm 52() (Fig. 2) counterclockwise. The link 59'! is restored to its normal position when the arm 595 moves clockwise to its normal position.

Obviously the operation of the above described mechanism upon depression of a key il@ effects a partial rotation of the shaft 5i@ corresponding in degree of rotation to the value oi the particular key depressed plusone. Thus if the 0. key is depressed the shaft 5i@ is rotated one step, the l key causes a two-step rotation, etc.

The Vdifferential rotation of the shaft 5l5 is effected by the 'continuously rotating gear 5H through the frictiondrive fat-5i@ as set forth above thus imparting through the master gear 506 (Figs. 7 and 8) and consequently to the particular set-up gear 69) in mesh with the master gear a rotation sucient to set the gear 455 to a position corresponding to the value of the depressed key li. Thus, if the 6 key il@ was depressed the wheel 193 then in mesh with the master gear 505 will be rotated seven steps to bring the 6 position on the wheel (158 under a sight opening 5h13 (Figs. 3 and 8) where it is visible to the operator.

Set-up wheels In setting up a number comprising a plurality of denominational orders on the set-up wheels 595 the operator sets up the highest denominational order rst, and then sets up the remaining denominational orders in succession from the highest to the lowest order. Assuming then that the 6 key il@ was depressed to set up the highest denominational order of a number, the set-up wheels Q98 (Figs. 4 and 7) are all the way to the right with the left hand one of the wheels 598 in mesh with the master gear 555. Als each number is set up the group of wheels (158 are shifted in two movements, one space to the left to bring the left-hand wheel in line with the right hand one of a series of racks 5715 and to bring the second wheel 398 into mesh with the master gear in readiness to set the next denominational order digit thereon. The mechanism for shifting the wheels (558 will now be described.

' As mentioned above the set-up wheels 555 are slidably mounted on the shaft 195. The group of Wheels 598 is embraced by a pair of arms 565 (see Fig. ll) projecting from a sleeve 565 slidably mounted on a shaft 5M supported in the bracket 555 and in the frame 52.

A roller 558 (Fig. 5) carried on the sleeve 555 projects into a spiral cam groove 559 formed about a cylindrical member 55@ secured on a shaft 55i rotatably supported in the frame 52 and in a bracket 552 secured to said frame.

IIn order to rotate the cam 555 a gear 553 secured on the shaft 55i near the frame 52 (Figs. and 5) meshes with a segmental gear 555 pivoted on the shaft 5511. Also meshing with the segment 556i is a gear 555 secured to an escapement ratchet 555 mounted to rotate on-a stud 55T! projecting romthe frame 52. A spring 555 having one of its ends secured to the arm5lfl mounted on the shaft 557i and secured to the segment 555 normal- 1y urges the segment 554 counrclockwise and the gear 555 and ratchet 556 clockwise (Fig.

' but these parts are prevented from'rotating due to the cooperation of an escapement pawl 568 loosely mounted on a shaft 566 supported between the frames 3| and 32. 'I'he pawl 56D is normally urged clockwise to the position in which it appears in Fig. 5 by a spring 561. Secured to the shaft 566 adjacent the pawl 560 is an arm 568 carrying a stud 569 projecting into a slot 510 in the pawl 560. The bifurcate'd end of an arm 51| secured on the shaft 566 between the frames 31 and ||8 (Figs. 4 and 6) embraces a stud 512 (Figs. 1 and 6) projecting from the bail arm 69| through a clearance opening in the frame ||8.

It will be recalled that the bail arm 69| is rocked counterclockwise (see Fig. 6) upon energization of the bail magnets `(i911. This movement is transmitted through the stud 512, arm 51| and shaft 566 to rock the arm 568 (Figs. 5 and 8) counterclockwise. Near the extreme of this movement of the arm 568 the stud 569 (Fig.

5) strikes the left hand end of the slot 510 and rocks the'pawl 560 slightly counterclockwise to disengage a hook 513 from the ratchet 556, and, at the same time, moving a nose 516 into the path of the next ratchet tooth.

As soon as the nose 513 is clear of the ratchet the spring 558 acting through the segment 556 rotates the gear' 555 and the ratchet 556 onehalf tooth space. This movement is transmitted by the segment 556 to the gear 553 and the cam 550 (see Fig. 4) rotating the cam suiiciently to displace the sleeve 566 and the group of wheels '698 one-half step toward the left. This movement is not suilicient to carry the particular wheel 698 `then in mesh with the master -wheel 586 out of engagement therewith.

At this point in the operation the master wheel 506 receives its increment of rotation underthe control of the depressed key H8, which in the present example is the "-6 key, and the pin drum 528, as set forth above, to correspondingly rotate the particular set-up wheel 698 in mesh therewith seven spaces to the "6 position after which the magnets 690 are deenergized by opening of the contacts 689 and the bail arm 69| is restored clockwise to normal.

As set forth above, the contacts 689 are opened at the end of the rotation of the pin drum 528, which also is at the end of the operation of the master wheel 506.

This rocks the arm 51| (Fig. 6) shaft 566 and arm .568 (Figs. 5 and 8) clockwise to free'the escapement pawl 560 to the spring 561, which immediately rocks the pawl in the same direction disengaging the nose 515 from the ratchet 566, and engaging the hook 516 therewith. At this time, and under the iniiuence of spring 558 the segment 556, receives its second movement advancing the ratchet 556 one-half step to complete a full step of movement. Likewise, the frame 565 and spiral cam 55|) receives their second clockwise rotation (Fig. 5) to shift the set-up wheel the second half step toward the left. This carries the highest denominational order set-up wheel out of mesh with the master wheel 5116, and positions that wheel just above and in a vertical plane with, but not in mesh with the right hand, or lowest denominational order rack of the series of racks 515 (Figs. 4, 6, and 7).

The same operation is repeated aseach key H8 representing a denominational order of a number being set up is depressed. The set-up wheels 696 being shifted one full step toward the left and by a bar 518 (Figs. 4, 6, and 8).

the next succeeding wheel being diierentially set according to the particular key 0 depressed.

Set-up wheel aligner In .their normal right-hand position (Fig. 4) the set-up wheels 698, with the exception of the highest order wheel, that is, the left-hand wheel, are in engagement with a fixed aligner 56|, se-

cured to, and projecting inwardly from the frame 32. This lock is not eective for the highest order wheel 698 as it is in mesh with the master gear 5,06 ready for a rotation.

As the wheels are shifted toward the left (Fig. 4) they are moved successively out of engagement with aligner 56| and-into engagement with the master gear 506 to receive their adjustment then out of engagement with the master gear 506 and into engagement with an aligner 562 carried by one arm of a bell crank 563 (Fig. 6) pivoted on the shaft 501. The other arm of the bell crank 563 carries a roller 566 cooperating by means of a spring 59| with the cam prole of a box cam 565 fast on a cam shaft 96.

At the proper time, after the amount is Set on the wheels 498 and after the racks 515 are lifted into mesh with the wheels 698, the` cam 565 operates to permit a spring 59| to rock the bell crank vdifferential movement under control of the previously adjusted set-up wheels 498.

After the racks 515 are set they are disengaged `from the wheels 698, and at the same time the aligner 562 is brought into engagement with the said wheels.

Rack engaging mechanism After the complete number or amount has been set on the wheels 698 the operator depresses a release bar 91 (Fig. 3), which, as will be later described, operates a one-revolution clutch (Fig. 9), to impart one complete counterclockwise rotation to the cam shaft 96. Mechanism is operated by the cam shaft to raise the racks 515 into mesh with the set-up wheels, and then restore said wheels to Zero or normal thereby diierentially setting the racks 515 a distance corresponding to the setting of the individual wheels 696. The movement of the racks 515 is utilized to actuate the totalizer and to set printing elements, as will be fully described later.

'I'he racks 515 are slidably mounted in a frame including plates 516 (Figs. 6 and 8) having their right hand ends pivoted on a stud 511, the racks being slotted at the right to embrace the stud 511. 'Ihe left hand ends of the` plates 516are joined 'Ihis endof the rack frame is adapted to be raised and lowered to bring the racks 515 into and out of mesh with the set-up wheels 698. The frame is guided in its movement by projections 519 (Fig. 4) on a cross bar 588, supported between frames 3| andv 3.2. T'he racks 515 are slotted near the left hand ends and are slidably mounted on a rod 58| (Fig. 6) extending between the side plates 516 of the rack frame. In its normal position the bar 516 rests on a plate 582 secured to the bottom of the bar 580, and extending beneath the bar 5| 8 (see Fig. 6).

'I'he mechanism for raising the racks into mesh with the set-up wheels includes a groove 588 in the box cam 565' (Fig. 6), fastened on the cam shaft 94. This cam is adapted to rock a lever 584 pivoted on a stud 585 projecting from the frame 9|. A flattened stud 586 on the left hand end of the lever 584 rests beneath an arm 561 pivoted to one arm 588 of a bell crank 589, mounted on a rod 599. Formed on the end of the arm 581 is a slotted ear 596 surrounding an angular projection 591 on the plate 516 nearest the frame 3|. The purpose of this construction will be explained later.

Referring to Fig. 6, it is obvious that rotation of the cam 565 through the groove 583 will rock the lever 584 rst clockwise and then counterclockwise to normal. On its clockwise movement the lever 584 by means of stud 586 rocks the arm 581 counterclockwise to raise the rack frame, thus carrying the racks 515 into mesh with the set-up wheel 498.

Set-up wheel restoring As soon as the aligner 562 is re-engaged with the set-up wheels 498, these wheels are shifted toward the right (Fig. 4) to their normal position by one continuous movement. This is accomplished by rotating the cam 550 and consequently by the cam groove 549 moving the frame 545 backwardly the same distance it was moved to shift the wheels 498 step-by-step as the numbers are set up. As the escapement pawl 560 (Figs. 5 and 8) is operated to permit the spring 556 to rotate the segment 554 in the setting up of numbers, another segment 598 (Fig. 8) pivoted on the shaft 93, and meshing with a segment 599 integral with the segment 554 is correspondingly rocked to carry a roller 600 on an arm 60| integral with the segment 598, into the path of a profile cam 602 fastened on the shaft 94.

Near the end of the rotation of the shaft, the cam 602 rocks the arm 60| and the segment 598 counterclockwise to normal, rocking the segment 554 clockwise to its normal position. This movement of the segment 554 rotates the gear 553 r and the cam 550 counterclockwise sliding the sleeve 546 and its group of set-up wheels 498 toward the right to the position in which they appear in Fig. 4.

At this clockwise rotation of the segment 554 the gear 555 and the ratchet 556 a're also rotated counterclockwise. This rotation, however, is idle since the escapement pawl 560 vibrates idly, the slot 510 being of suiicient length to permit the pawl to vibrate without displacing the stud 569.

Error key mechanism Means is also provided to rotate the set-up wheels 498 backwardly to zero in case an erroneous set-up is made thereon. This means includes a restoring rod 603 (Fig. 5), carried between a pair of arms 604 secured on the shaft 499. The rod 603 extends through all of the slots 596 in the wheels 498, and is of suiicient length to permit the longitudinal movement of the group of wheels 498 as they escape to the left (Fig. 4) when being set up. A gear 605 (Fig. 8) secure-d to the shaft 499 meshes with a segment carried on an arm 606 pivoted on the shaftl 93 and forming one arm of a lever. The other arm 601 of the lever carries a roller 608 projected into a cam groove 609 in a cam 6 |8 secured to the cam shaf t 94.

The cam 6| 0 operates to rock the lever 606-601 clockwise, which rotates the gear 605, shaft 499, and the restoring rod 603 counterclockwise to restore the wheels 498 to normal. On normal operation the wheels 498 are restored as the racks 515 advance toward the right, the restoring rod 603 following this movement, to insure that all of the set-up wheels 498 are fully restored in case of failure.

However, on operations wherein an erroneous number has been set up on the wheels, the operator presses the error key |28 which will be described later, renders the rack engaging mechanism ineiective, so that the set-up wheels 498 will not be restored by the racks 515 as they move toward the right. In this case, operation of the restoring rod 603 (Fig. 5) effects the complete restoration of the set-up wheels 498, to their normal position.

Locking devices for actuating racks A number to be set on the set-up wheels 498 may vary in the number of denominational orders from one to nine, the numbers being limited in denominational order to the numbers of the setup wheels 498 provided in the machine. In the illustrated embodiment, nine of these wheels are provided, however, when a number is set on these wheels utilizing less than the nine wheels, certain of the racks 515 will not cooperate with the wheels 498, in which case it is necessary to provide means to preventsuch racks as Ido not mesh with the setup wheels 498 from movement toward the right.

This means includes a series of pawls 6| (Figs. 4 and 6) there being a pawl 6| cooperating with each rack 515. The pawls 6| are pivoted on a rod 6|2, mounted in a bracket 6| 3 carried on ears 6| 4 bent inwardly from the upper edge of the side plates 516 of the rack frame, (see Fig. 6). Referring to Fig. 6, it can be seen that the pawls 6| rest in the paths of projections 6|5 on the left hand ends of the racks 515. As the group of set-up wheels 498 escape toward the left (Fig.I

7) a projection 6|6 on the sleeve 546 positions itself over tails 6|1 projecting from pawls 6| When the rack frame 516 is brought upwardly to mesh the racks 515 with the set-up wheels 498, the tails 6| 1 of the pawls 6|| move upward therewith, and the projection 6 I6 rocks the pawls clockwise aboutpivot 6|2 to remove the pawls from cooperative relationship with the projections 6|5 on the racks 515.

Obviously only those pawls 6|| will be rocked which lie beneath the projection 6|6. Thus, if a number comprising four denominational orders is-set on the wheels 498, the left hand four of these wheels (Fig. 4) will engage the right hand four of the rack 515. Likewise the projection 6|6 will move left over the four pawls 6|| to the right. Now when the rackframe 516 is rocked upwardly (Fig. 6) the four pawls tothe right will be rocked out of engagement with their respective racks, whereas the remaining pawls 6|| cooperating with higher denominational order racks 515 will remain in their position wherein they are effective to restrain the racks 515 from moving toward the right (see Fig. 6) to set the printing type elements to be described later.

It was stated above that after an amount was set on a set-up wheel 498, and before the release bar 91 (Fig. 9) is pressed to operate the machine, the operator may observe the amount set on the wheels 498 through the sight opening 543 (Fig. 8). If the amount set thereon does not correspond to the amount desired to be entered, the operator may, by pressing the error key |28, (Fig. 6) erase the setup from the wheels 498 without entering the amount into a totalizer or printing the amount on the record materials. This is accomplished by preventing the engagement of the racks bis with the set-up wheels 398, and operating the machine through the regular cycle. rIhis error correcting operation is effected by the depressing of the error key 23 (Fig. 6) which is mounted on a lever Bld. The lever bib is bent, as illustrated at M9, and is pivoted on a stud 62@ supported in a projection' 62! (Fig. 4) on the cross bar 58u.

A link i522 (Fig) connects the lever lii to the arm 588 of the bell crank 589 so that when the error key E23 is depressed rocking the lever Si@ 'counterclockwisa the link 622 rocks the bell crank 539 likewise counterclockwise. This thrusts the link 58? toward the right, moving the end of the link out of cooperation with the stud 5B@ in the lever 581i. Now when the cam groove 583 (Fig. 6) rocks the lever 586 clockwise the stud 536 carried by the arm 58d rocks idly without moving the link 531, or transmitting the movement of the rack frame. The other arm @2i of the bell crank 589 carries an ear 628 which cooperates with a shoulder on a detent @gato hold the key depressed during the operation.

Depression of the error key lZ also operates the release bar Si in the following described manner: An arm 623 rigidly connected to the bell crank 589 (Fig. 6) but spaced apart therefrom on the shaft 590 rests immediately above the stud 3m on the release bar (see also Fig. 9) so that when the bell crank 589 is rocked eounterclockwise by depression of the error key `-lid,'the arm 623 acting on the stud 3l@ moves the release bar si' downwardly to release the machine for an adding cycle. As just explained, the racks 515 are not raised into engagement with the set-up wheels 598 on this operation, also these racks are not shifted toward the right, due to the pawls 6l i remaining in engagement with the projection t i However, the segment 55d (Figs. 5 and 8) is given its restoring movement to rotate the cam 550, thus restoring the wheels 398 in one stroke to their normal right hand position, as viewed in Fig. 4. Likewise the cam groove 69 (Fig. 8) operates the arm S to rotate the gear 605, which 'in turn operates the restoring rod 03 (Fig. 5) to rotate the set-up wheels 39B counterclockwise to their normal positions.

.Rack operating 'mechanism Referring to Fig. 8 each of the racks ST5 carries a stud 626i at its right hand end'which stud is embraced by the bifurcated end of an arm i525 of a bell crank Si pivoted on a shaft i532. The other arm 633 (Fig. 11) of the bell crank @iii is also bifurcated and straddles a stud 634 carried by a vertically disposed rack 635. There is a bell crank il and vertical rack 635 for each denominational order rack til.

At its upper end the vertical rack 635 carries type elements B36 slidably mounted therein; and slidably mounted on the rack i535 are totalizer actuators 631. The purpose of the bell crank 63E is to transmit the movement of the rack bib to the vertical rack 635, for the purpose of positioning the type element S36 differentially, and for actuating the totalizer Si@ to enter the amount set up on the keys H0.

The arms G25 of the bell crank are normally abutting abail Sil!) carried between a pair of arms lil (Figs. 8 and 11) secured to the shaft 632, by a spring 6432 stretched between a projection 643 (Fig. 3) on the lower side of the rack 515 and one of the rods Edd carried between the arms Ml.

After the racks 5i@ have been rocked into enaovaoiv gagement with the-previously set set-up wheels Q93, the bail tdi@ (Fig. 8) receives an invariable excursion, rst counterclockwise and then clockwise to normal. On its counterclockwise travel. the rod @lili acting through the spring @32 draws the racks 5715 which were engaged with the setup wheels toward the right therewith, each rack i'i being diierently stopped by its corresponding set-up wheel 198, engaging the stop rod iii (Fig. 5). The rod tl@ continues its invariable excursion after the racks bib are arrested merely stretching the springs 65432.

After the racks ST5 are disengaged from the set-up wheels 696, as described above, the bail 54d receives its clockwise or restoring movement to shift the racks alb leftward to their normal position.

The means for operating the bail bfi@ is illustrated in Fig. 3, and includes a pair of complementary cams @35 fast on the shaft @il cooperating with rollers carried on a curved arm 46 pivotally supported on a rod 38. A link till connects the curved arm Sil@ with an arm tilt secured to the shaft 632. At each adding cycle the cams @65 (Fig. 8) .rock the arm 6116 first clockwise and through the link @di rock the arm 66S, shaft @32, and the bail Sil@ coimterclockwise. The cams 565 then reversethis movement rocking the arm 6:36 counterclockwise and through the link @di rock the arm 653, the shaft @32 and the bail 6d@ clockwise to restore the racks 5i?) to their normal position.

Totclz'zers and printing mechanism It was stated above that each of the racks 535 (Fig. 11) are shifted vertically a distance commensurate with the movement of the rack Si?) under the control of therelated set-up Wheel 49%. This movement positions the corresponding type element 53e opposite a platen tl?. Mechanism is then operated to cause hammers il@ to `force the type element @35 against the record material in order to take the impression therefrom. This type oi printing mechanism is well known and is fully described in the parent application.

When the racks 35 (Fig. 11) are in their differentially raised positions, the totalizer @it is moved into mesh with the racks i337 and when the racks @Si are lowered the item is entered in the totalizer dit. The totalizer engaging means is fully described in the parent application.

Release bar Immediately after depressing the keys li@ the operator depresses the release bar @i rendering a one revolution clutch (Fig. 9) effective to impart one complete counterclockwise rotation to the cam shaft all in the following described Q5 (Fig. 9) fast on the drive shaft 93 meshing with a larger gear se rotatably mounted on the cam shaft 9d. A one revolution clutch is provided and is rendered effective under control of the release bar 97 tofcouple the cam shaft 9i?, to the gear 96 whereby the shaft Sii receives one complete counterclockwise (Fig. 9) rotation at each adding cycle. This clutch and release bar will now be described.

aovgoiv The bar 9i is mounted on a stem 308 which is slidably supported by a pair of headed screws 389 projecting from the frame 3|. The stem 308 carries a stud 3| 0 which is embraced by the bifurcated end of one arm of a bell crank 3| I having its other arm connected by a link 3|2 to a lever 3|3 pivotally supported on the frame 3|. Depression of the release bar 9'? rocks the bell crank 3| I clockwise drawing the link 3|2 leftl ward (Fig. l1) thus rocking the lever 3|3 also clockwise. This raises a link 3|4 depending from one arm of the lever 3|3. The link 3M has a shouldered notch in one edge thereof normally held by a spring 3|5 in cooperative relation with a stud 3|6 projecting from a retaining pawl 3|? pivoted concentrically with the lever 3|3.

'I'he pawl 3|`| coop-erates with the tail of a drive pawl 3|8, pivotally carried on a disc 3|8 secured to the cam shaft 94, to hold said pawl i() 3|8 out of engagement with a drive ratchet 328 secured to the gear 98 and constantly rotated thereby in a counterclockwise direction (Fig. 9).

The clockwise movement of the lever 3| 3, im-

m parted thereto by depression of the release bar e" 97, as above stated, raised the link 3M which, due to the stud 3|6, rocks the ,retaining pawl 3|'l clockwise against the tension of its spring 328, freeing the drive pawl 3|8 to the action of its I spring 32? which immediately rocks the pawl 3|8 into engagement with the ratchet 328. The

disc 3| 9 is now rotated counterclockwise one complete rotation.

Shortly after the disc commences its rotation a block 328 secured to the side thereof strikes m the lower end of the link 3| 4 and rocks the link clockwise to free the pawl 3|'I to its spring 328 which rocks said pawl counterclockwise against a stop stud 329. Near the end of the rotation of the disc 3|9 and of the shaft 94 to which it is fast, 40 the tail of the drive pawl 3 |8 strikes the pawl 3|?, rocking the drive pawl 3|8 out of engagement with the ratchet 328 to stop rotation of the shaft 94. A spring-pressed pawl 330 cooperates with a notch in the periphery of the disc 3|9 to prevent retrograde movement of the shaft 94.

Key release key It will be recalled that the error key |28 when depressed is latched down by the detent 628 (Fig. 6). To release the key a special key |3| (Fig. 12)

is provided which functions to release the key |28 by shifting the detent 629 to ineffective position.

The key release key 3| is pivoted on the rod d5 530 (Fig. 12) and is operated against the tension of a spring |225. The key has pivoted thereto a link |238 having a slot |23| receiving a pin |232 carried by an arm |233 secured to one arm of a bail |88 against which the detent 629 is spring- 6" pressed. when the key 13| is depressed the link |230 iselevated raising the free end of arm |233 and rocking bail I| 88 counterclockwise to rock the latch 629 and thus releases the error key |28. While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a-single modification, it Will'be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims. What is claimed is as follows:

1. In a machine of the class described, in combination, a series of digit wheels, a single master wheel for setting said digit wheels seriatim, an escapement mechanism for controlling the operative relationship between said master wheel and said series of digit wheels, a rotatable drum for controlling the differential movement of said master wheel and having a series of digit determining members, a movable stop normally cooperating with the member previously rendered operative, a series of ten keys, a series of magnets for shifting said members, an electrical circuit for each of said magnets and controlled by the related key, an electro-magnet adapted to shift said stop to release said drum for rotation, means whereby said electro-magnet operates said escapement mechanism, and an electrical circuit for said electro-magnet including controlling contacts closed by the depression of any key to energize said electro-magnet.

2. In a machine of the class described, in combination, a series of digit wheels, a series of ten keys, a master wheel, means for preventing rotation of said master wheel, a digit setting mechanism for determining the differential rotation of said master wheel comprising a series of digit stops, electro-magnets for shifting said stops, circuits for said magnets including key controlled contacts, an electro-magnet, a member operable by any one of said keys and adapted to close a set of contacts to energize an electro-magnet in electrical series therewith, an operating member operated by the last named electro-magnet, for releasing the master wheel for rotation, an escapement mechanism for controlling the operative relationship between the digit wheels and the master wheel, and means whereby said operating member causes the operation of the escapement mechanism when said electro-magnet is energized.

3. The combination with a series of ten keys, of a series of digit wheels, a master wheel for setting said digit wheels differentially, digit electrical circuits closed'by said keys, a normally locked digit setup mechanism controlling said master wheel and including shiftable digit stops, a series of electrical means for shifting said stops ccntrolled by said circuits, an arresting member engaging the previously shifted digit stop, an electromagnet, an electrical circuit therefor closed by the depression of any key, means whereby said electro-magnet causes the movement of said arresting member to release the digit set-up mechanism, means whereby said electro-magnet controls the operative relationship of said digit wheels and said master wheel, and means whereby the electro-magnet opens its electrical circuit.

4. The combination with a series of ten keys, of a series of digit wheels, a master wheel for setting Said digit wheels, a power drive, a friction drive between said master wheel and said power drive, a digit-set-up mechanism rotatable with said master wheel and including digit stops set by said keys, an `arresting member engaging the previously shifted digit stop to prevent rotation of said master wheel by the power drive through said friction drive, an electrically operated means set in operation by the initial depression of a key for shifting said arresting member, and means whereby said electrically operated means changes the operative relationship between said master wheel and said digit wheels.

5. In a machine of the class described, the combination with a series ol item wheels, of a series of keys depressed manually, of means for opening of the selected digit electrical g) differentially setting said wheels, a series of electro-magnetic means for controlling the difierential operation of said setting means and each in ,a related digit electrical circuit, key controlled contacts, one in each digit electrical circuit for selecting the` related `digit electrical circuit, a set of contacts closed by any depressed key to cause closure of the selected digit electrical circuit and automatically opened after the depression of a key, and means for causing the circuit before said set of contacts automatically open.

6. In an adding machine, a set of ten keys, a set of digit wheels, a master gear for setting said digit wheels,'a digit set-up controlling mechanism for said master gear comprising a drum with a series of shiftable digit stops, a plurality of electro-magnetic means controlled by said keys for shifting said stops, a drum arresting member normally engageable with the previously shifted digit stop, electro-magnetically operated means, means whereby the electro-magnetically operated means shifts said drum arresting member to release the drum for rotation, means carried by said drum to thereafter restore the drum arresting member to a position to engage the' digit stop shifted by the depression of a key, an electrical circuit including a set of contacts closed by the depression of any key to cause an operation of the electro-magnetically operated means, and means whereby the digit stop shifted by a depressed key causes the opening of the set `of contacts.

'7. In an adding machine, a series of keys, a series of digit wheels, a master wheel to turn said digit wheels, a continually revolving motor shaft having frictional means connected to said master Wheel to turn said master wheel, a normally locked evaluatingmechanism movable differentially for controlling the rotation of said master wheel, an escapement means to control the operative relationship of said master wheel and said digit wheels, a series of electro-magnetic means controlled by the keys for determining the extent of movement of said evaluating mechanism, an electro-magnet, electrical means including contacts closed by any key for causing the electro-magnet 'to be energized upon the operation of any key,

means whereby said electro-magnet releases the evaluating mechanism for movement and causes the operation of thev escapement means, and means for opening said contacts. l

8. In an adding machine, a series of keys, a series of digit wheels, a dierentially rotatable master wheel for setting said digit wheels, an

'escapement means for controlling the operative relationship of said master wheel and said digit wheels, an electro-magnet for causing the. operation of said escapement means, an electrical circuit for said electro-magnet, contacts closed upon the initial operation of any key to close said electrical circuit and thereafter automatically opened, a relay magnet, an electrical circuit therefor including normally closed contacts, said electrical circuit being closed by the rst named contacts, relay contacts closed when the relay magnet is energized to provide a shunt for the first named contacts, and means whereby said electro-magnet opens the normally closed contacts to` open the circuit of the" relay magnet to cause its deenergization.

9. In an adding machine, the combination with a series of digit wheels, of a driving shaft, a series of keys, a master wheel for setting said digit `wheels frictionally driven by said driving shaft,

normally locked means for controlling the rotation of said master wheel, settable digit stopsA for said electro-magnetic means, contacts controlled by any of said keys and closed to energize the electro-magnetic means, and means whereby the electro-magnetic means causes the opening of the digit electrical circuits.

10. In a ten-key adding machine, a series of ten digit keys, a series of digit wheels, a master wheel for successively rotating said digit wheels, a master wheel rotation controlling device comprising a drum carrying settable digit stops shifted under control of said keys, a continually rotating driving shaft having a frictional driving connection with said drum, locking means engageable with a previously shifted digit stop for normally locking said drum to prevent rotation of said master wheel, means operated by the depression of a key for shiftingsaid locking means out of engagement with the previously shifted digit stop, means on said drum to shift said locking means to engage with the next digit stop shifted by the depression of akey, and a camming means stationary with respect to said drum for camming the previously shifted stop to an inoperative position.

1l. In a machine of the class described, a series of digit wheels, a digit wheel setting device comprising a rotary drum carrying a plurality of shiftable digit stops, a stop member for normally arresting said drum against rotation by engagement with a previously shifted stop, a series of depressible keys for shifting said digit stops, means operated by the depression of any key for shifting said stop member out of engagement with a previously shifted digit stop, means carried by the drum to cause said stop member during the rotation of the drum to be shifted to engage the next digit stop shifted by a depressed key, a camy ming device engaging the shifted digit stop for 'returning it to an inoperative position after it wheels, a power drive, means under control of said keys for causing differential rotation of said setting means by said power drive to successively set up said digit Wheels, a pair of transverse rods passing'through arcuate slots in said digit wheels, means operated by said power drive for resiliently shifting said operating racks under control of said digit wheels as the latter are restored to normal to positions determined by engagement of one of the transverse rods with certain closed ends of the arcuate slots, and means for causing the movement of the other transverse rod to engage with other closed ends of the slots as aovaoiv said digit Wheels are restored to normal to insure the differential setting of said operating racks.

13.. In a machine of the class described, in com bination, a set of keys, a power drive, a plurality of rotatable digit representing Wheels, means 0perated by said power drive and under control of said keys for setting up said digit representing wheels, a series of operating racks normally out of engagement with said digit Wheels when the latter are being set un, a transverse rod in engagement with vclosed arcuate slots of the digit wheels, means operated by said pov/er drive to engage the digit wheels with the operating racks, resilient means operated by the power drive for tlien moving the racks until the digit Wheels are rotated to a nome position, and means operated by the power drive to move said rod and by its engagement with the closed ends or" the slots assist the resilient means to rotate said digit wheels to nome position.

lei. Ina machine oi the class described, in combination, a series of digit Wheels, means for setting said digit Wheels to represent an amount, operating racks, a stationary transverse rod passing through arcuate slots in said digit Wheels, a sup plemental movable transverse rod also 'passing through said arcuate slots, resiliently-operated means operated by the power drive to move said operating racks to restore said digit Wheels to normal and differentially set said operating racks limited by the engagement or tne ends of the arcuate slots with the first-named rod, and an error correcting mechanism having connections for causing the movement of the movable transe verse rod to restore tile digit Wheels to normal Without setting said operating racks.

i5. in a machine of the class described, in coin= bination, a set of digit wheels, operatimT adapted to be engaged with, the diierentiady set digit Wheels, a movable transverse rod in en@ gagement with arcuate slots oi said Wise-els,

means for resilientiy shifting said racks while engaged with tne digit wheels to diderentiai pesin tions, ineens for concurrently moving said roe. to insure the complete dierentiei setting oi said racks, an error lrey, and connections whereby tile latter causes tne movement of said rodV to restore tile digit Wheels without diierentially setting said racks.

lo. In a machine of the class described, in conif1 bination, a set of digit Wheels .adapted to be dif= ferentially set, a set oi operating racks, a sewer drive, :means effective when the Wheels lieve been set and operated by said power drive causing said set or racks to engage with tire in wheels, means whereby said power drive tia siliently moves said raclzs to differential nos* determined by the setting oi tne means engageable With tice Wheels and op cwawm' by the power drive te restore the Wheels, :n error key depressibie nnen visually noting an error in the setting oi tlie digit Wheels, and ine e whereby the error: lzey renders tire means ineffective to prevent an engagement of 2 set o racks with the set of dierentiaily set wheels but causes the operation of the e gagealile with tlie wheels to restore tne 'ff' Wheels. l

i7. in a macinate of the class described, in conn bination, a series of digit Wheels, e series o lieg/e, means under control o keys :for settinla nn said digit v/iieels, operating' rac, a nor shifting said racks to engage with tile digit 'wheels which are set nge, element-s for normally lccmag all oi said racks, and means sliiiftable in accord= ance with tlie number of digit wheels eet n@ operated by said freine to cause ci elements to be operated unlock the racks en@ gageable with the digit Wheels which Soave neef set 

